7a^2-8=20

Simple and best practice solution for 7a^2-8=20 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 7a^2-8=20 equation: 


Simplifying
7a2 + -8 = 20

Reorder the terms:
-8 + 7a2 = 20

Solving
-8 + 7a2 = 20

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '8' to each side of the equation.
-8 + 8 + 7a2 = 20 + 8

Combine like terms: -8 + 8 = 0
0 + 7a2 = 20 + 8
7a2 = 20 + 8

Combine like terms: 20 + 8 = 28
7a2 = 28

Divide each side by '7'.
a2 = 4

Simplifying
a2 = 4

Take the square root of each side:
a = {-2, 2}

See similar equations:

| 8x^3-64x^2+x-8= | | (5m-1)(m+2)= | | y/3-y/2=y-1 | | a/3=-2a/5 | | 8-7x+6x=2 | | 0=2x+2x-4 | | 2x-6-3x=-17 | | 6n+37= | | 3x-5=2.5x+3-1(x-4) | | (5+w)(2w-7)=0 | | 2x-4=5x-1 | | 4y=5x-12 | | 10x^2-56x^2-56=0 | | (4-5)-(13-18+12)= | | 5.3-x=2.6 | | 5(a+b)-2b=0 | | ln(x+1)=2x | | 3-(7x-56)=3 | | y=2x^2-2x-2 | | 2x=(365/4) | | cot(2x)=-cot(4x+220) | | U^2-11u-42=0 | | (3-v)(4v+9)=0 | | x6*x2/x4 | | x^2-x^4+24x^2+144=4 | | 3.141592653x-17=20 | | 28-(-2)= | | (6x-5)(7x+9)=0 | | (-3)+6= | | 6u^2+6u=-20 | | 3m+6-2m=2 | | (-4x+7)+(-2x^2+4x+6)= |

Equations solver categories